what does raidctl -s and -m (separate commands) say?
raidctl -s raid0 Components: /dev/wd0a: optimal /dev/wd1a: optimal No spares. Component label for /dev/wd0a: Row: 0, Column: 0, Num Rows: 1, Num Columns: 2 Version: 2, Serial Number: 2013090100, Mod Counter: 75 Clean: No, Status: 0 sectPerSU: 128, SUsPerPU: 1, SUsPerRU: 1 Queue size: 100, blocksize: 512, numBlocks: 3873470720 RAID Level: 1 Autoconfig: Yes Root partition: Yes Last configured as: raid0 Component label for /dev/wd1a: Row: 0, Column: 1, Num Rows: 1, Num Columns: 2 Version: 2, Serial Number: 2013090100, Mod Counter: 75 Clean: No, Status: 0 sectPerSU: 128, SUsPerPU: 1, SUsPerRU: 1 Queue size: 100, blocksize: 512, numBlocks: 3873470720 RAID Level: 1 Autoconfig: Yes Root partition: Yes Last configured as: raid0 Parity status: DIRTY Reconstruction is 100% complete. Parity Re-write is 79% complete. Copyback is 100% complete. raidctl -m raid0 raid0: parity map enabled with 4096 regions of 462MB raid0: regions marked clean after 8 intervals of 40.000s raid0: write/sync/clean counters 43509/2112/1712 raid0: 871 dirty regions raid0: parity map will remain enabled on next configure